content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
   * Other names may be trademarks of their respective owners.]
   *
   * ------------------
   * PlotUtilities.java
   * ------------------
   * (C) Copyright 2007, 2008, by Sergei Ivanov and Contributors.
   *
   * Original Author:  Sergei Ivanov;
   * Contributor(s):   David Gilbert (for Object Refinery Limited);
   *
   * Changes
   * -------
   * 26-Sep-2007 : Version 1, contributed by Sergei Ivanov (see patch
   *               1772932) (DG);
   *
   */
  
  package org.jfree.chart.plot;
  
  import org.jfree.data.general.DatasetUtilities;
  import org.jfree.data.xy.XYDataset;
  
  /**
   * Some utility methods related to the plot classes.
   *
   * @since 1.0.7
   */
  public class PlotUtilities {
  
      /**
       * Returns <code>true</code> if all the datasets belonging to the specified
       * plot are empty or <code>null</code>, and <code>false</code> otherwise.
       *
       * @param plot  the plot (<code>null</code> permitted).
       *
       * @return A boolean.
       *
       * @since 1.0.7
       */
      public static boolean isEmptyOrNull(XYPlot plot) {
          if (plot != null) {
              for (int i = 0, n = plot.getDatasetCount(); i < n; i++) {
                  final XYDataset dataset = plot.getDataset(i);
                  if (!DatasetUtilities.isEmptyOrNull(dataset)) {
                      return false;
                  }
              }
          }
          return true;
      }
  
  }
  